Rotary engine.



PAT-ENTED MAR. 81, J. A. LEASK.

ROTARY ENGINE.

APPLIOATION rum JUNE 19.1907.

3 SHEETS-SHEET 3..

I a g al rom uu o ND. 883,319. PATENTED MAR. 31. 1.908.

J. .A. LEA-SK.

ROTARY ENGINE.

APPLIGATION FILED JUL'ElQ. 1907.

3 $HEETS-SHEET 3.

JAMES A. LEASK, OF ORANBROOK, BRITISH GOLUMBIAQOANADAU 'no'ranv ENGINE.

Specification of Letters Patent.

Patented March 31, 1908.

Application filed June 19, 1907. Serial No. 379,820.

To all whom it may concern:

Be it known that I,JA,MEs A. LEAsK, a subject of the Kin of Great Britain, and residing at Cranbroo r, British Columbia, Canada,

have invented certain new and useful 1m provements in Rotary Engines, of which the following is a specification.

My invention relates to rotary engines, and consists in an engine having a circular cylinder, a iston elliptical in cross section, and radial sliding abutments, and ports and passages, as fully set forth Hereinafter and as illustrated in the accompanying drawing, in which:

Figure 1 is an. end elevation of a rotary engine embodying my invention, the cylinder head removed; Fig. 2 is a transverse section of part of the cylinder and iston, showing the parts constructed ani arranged in a reversible engine; Fig. 3 is a section on the line 3, Fig. 1; Fig. 4 is a face view looking from the outside of one of the disks connected with the piston; Fig. 5 is a face View of the inner section of one of the cylinder heads looking from the outer side; Fig'. 6 is a view in )art section transversely throughd he cylinder head; and Fig. 7 is a longitudinal section at one end of the engine.-

The cylinder W is cylindrical and has at each end a sectional head X, and within the cylinder rotates an elliptical. piston A, the trunnions, or shaft, 3 of which extends centrally through hearings in the cylinder heads.

.ln one or both cylinder heads are two concentric annular channels 4, 5, the channel 4 communicating.with an inlet pipe 6 and. the

channel 5 with. an exhaust pipe 7. In the cylinder head, extending from the channel 4 to the inner face and equidistant from each other, are four steam-inlet ports 8, and in the cylinder head extending from the inner face to the channel 5, and equidistant from each other, are four outlet-ports 9, and, as shown in Fig. 5, the centers of the outlet ports are not upon the same radial lines as those of the inlet ports but are at one side of the latter.

Each trunnion 3, beyond the end of the piston A, extends through a disk H which is secured to and turns with the piston. and which has upon opposite sides of'the center two ports 10, 10, Fig. 4 soarranged that they may be brought to coincide with the ports 8, and shown as circular, and also two elongated exhaust ports 12, 12, which maybe nought to coincide with the exhaust ports 9 in the cylinder head. In the cylinder W, equidistant from each other, are longitudinal radial o enings r in which slide radially abutments each of the latter consisting of a longitudinal bar having a recess 1 to receive a radial guide blade 15 extending into the recess 1', and the abutment carrying at the inner end a pivoted shoe 16, the face of which bears upon the face of the piston A. As shown the shoe has at the back a circular rib adapted-to a longitudinal recess in the blade so that it can swing to secure a constant bearing upon the face of the piston.

Each of the recesses :6 extends to the end of the piston and so do the abutments B, and in Fig. 1 each of these abutments is so supported by the blade 15 as to leave a space or channel w between one side of the abutment and the side of the recess, and the ports 8 are so arranged, as shown in dotted. lines in Fig. 1, that one of the ports 1.0 of the disk H is brought to coincide with a port 8 as the point C of the piston passes an abutment B and the steam may pass from the port 10 through the port 8 into the space'w and to the space. defined by one side of the abutbegins to coincide with the port 9 at the right,

when the steam will at once pass from the space which it occupied to the exhaust, and this will continue on both sides of the piston until the ports 12 and 9 are no longer in communication. By this time the other point (3 of the piston, that is the point upon its greatest diameter, will have passed below and beyond the upper abutment and the adjacent port 10 will be brought into communication with the upper port 8 and steam will pass through the passage w into the space between the upper abutment and the converging faces of the piston and cylinder with the same action as before. The same effect resultsin connection with each abutment as a port 10 is brought into communication with the port 8 adjacent to said abutment.

In order to make a reversible engine the abutments B are arranged so as to leave pas- 'the direction of the arrow 7),

the piston 1 arrow a, Fig. 2, but by admitting it to the other end of the cylinder it will pass to the I passages w and the piston wli ll be turned in In order to maintain a close joint between the piston and the head of the cylinder the piston has bosses 20 extending into central recesses of the heads X, and annular packings K closing the joints, and the piston has longitudinal recesses 12 in which fit strips or packing blades G which are pressed outward against the surface of the cylinder by springs 33, as best illustrated in Fig. 3, and as these stri s G wear from time to time they may be reg aced.

t will be seen hat as steam is admitted to the recesses a: it bears upon the abutments B and loads'the same so as to maintaina tight contact between the shoes and the faces of the iston.

It Wlll also be seen that as the piston is elliptical in cross section the abutments restin thereon will be carried outward gradua ly, that is, each with a slow movement so as to avoid any hammering in the apparatus. It will further be seen that the ports 10 may be proportioned so as to secure the admission of steam for any desired length of time and they serve in connection with the ports 8 to admit the steam and cut it off before the piston has completed its rotary stroke, thereby permitting the use of the steam expansively.

Packings K, are arranged to becarried by the disk H so as to close, the joints between that disk and the cylinder head, and an H surrounds each port 8 to annular packing between the port and the close the joint disk-H.

While the cylinder head may bev constructed in any suitable manner I prefer to make it in sections, one section V, which is annular, containing the ports 8 and 9, the next section '0, also annular and containing the annular channels 4 and 5, while an outer section v aids in forming the channel 5 by means of an innerboss section is bolted a box bitt bearing .9 for the shaft or trunnion 3. The different sections of the head are held 21, and to this outer 10 at opposite sides of the abutl s turned 1n the direction of the I 4. The combination ofthe l der, piston elliptical in cross section, radially N containing a Bah- Witnesses:

together and bolted to the body of the cylinder by means of bolts 22.

.Without limiting myself to the precise construction and arrangement of parts shown, I claim: I 1. A rotary engine provided with a circular cylinder, a piston elliptical in cross section rotating within said cylinder, a disk carried by the piston and provided with inlet and exhaust ports, abutments radially movable within recesses in the cylinder, and ports in the cylinder head for admitting steam to and conducting it from the respective inlet and outlet ports in the said disk.

2. The combination of the circular cylinder, a piston elliptical in cross section, radially movable abutments, a disk carried by .the piston and having inlet and exhaust ports, a cylinder head having-concentric circular channels communicating with inlet and leading from the inner Bite 0 the head to the steaminlet channel, and exhaust ports communicating with the steam outlet channel and extending to the inner face of the head and arranged upon radial lines'at one side of those passing through the inlet ports.

3. The combination of the circular cylinder having radial recesses, abutments sliding in said recesses and carrying ivoted shoes, an elliptical piston against w ich the shoes bear, a cylinder head having inlet and outlet ports, and an intermediate .disk connected to be carried with thepiston and having inlet and outlet ports, each abutment arranged to afford a passage between one side andthe side of the recesses in-the cylinder.

i In testimony whereof I affi x' 'my signature .in presence of two witness'esb I JAMES-A. LEASK.

, G. A. SGHAEF, I GEORGE R. LEASK.

circular cylinmovable abutments bearing upon the piston. a passage at one side of each abutment lead 

